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is in decline. researchers at the australian institute of marine science say the reef has lost half of its coral cover over the past 27 years. there are multiple causes, including a destructive kind of starfish shown here. we look at what's behind it and what's at stake-- in australia and around the world-- with nancy knowlton, a coral reef biologist and a chair of marine science at the smithsonian national museum of natural history here in washington. welcome. >> thanks. how has all of this coral died off? do we know what's causing it? is it all that... >> it's not all the star fish. the star fish is about 42%. typhoons, big strong storms another 48% and then coral bleaching is the remaining 10% which is caused whenever the water gets too hot. >> ifill: so this is human causedded? >> yes. most of it is human caused. i mean a coral reef naturally goes through cycles of up and down. but it shouldn't be declining by half over course of 27 years. >> ifill: i feel like we have talked before about the declining coral cover. but not... but i'm wondering whether it's now picking up speed or whether thi
science, technology, and improved economic performance and financial literacy in the 21st century. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> woodruff: israel's prime minister warned again today that iran is well on its way to creating a nuclear weapon and said the world needs to act. benjamin netanyahu spoke at the united nations. as he has often before, netanyahu condemned iran and its nuclear program, and called on other leaders to do the same. >> at stake is not merely the future of my country. at stake is the future of the world. and nothing could imperil our common future more than the arming of iran with nuclear weapons. >> woodruff: the israeli prime minister said the hour is, quote, "getting late" to stop iran as it continues its nuclear work. >> i speak about it now because the iranian nuclear calendar doesn't take time out for anyone or for anything. i speak about it now because when it c
results in just two days. the research was published in the journal, "science translational medicine." the paper reported the tests of just six newborns in neonatal units, but the implications could be widespread. roughly 20% of infant deaths in the u.s. are caused by inherited genetic conditions, according to the study. doctor stephen kingsmore led the research team at children's mercy hospitals in kansas city. he's the director for the center for pediatric genomic medicine there. dr. kingsmore, welcome, and thank you for being with us. first of all,-- >> thank you very much. >> warner: how big a breakthrough is this? >> this is a big breakthrough. we've been working toward this goal for a coup of years now. there has been a big gap between the knowledge that we have of genetic diseases, about 35% of them, and the ability for doctors to identify which of these was a problem in any given child with an illness. >> warner: and up until now, how much have you been able to diagnose the d.n.a. abnormalities? how quickly? i mean, i said it can take weeks and weeks, but what's the process t
Search Results 0 to 2 of about 3